The National Transportation Safety Board is urging SEPTA to implement recommendations immediately to stop the fire risk in the Silverliner IV railcars, the NTSB announced on Wednesday.

In the recommendations , the NTSB states that the outdated design of the Silverliner IV railcars, combined with SEPTA's maintenance and operating practices, poses an unacceptable safety risk due to the severity of the electrical fires that can spread.

"The NTSB also found that SEPTA's current operating practices have failed to protect passengers and crews because defective railcars have been kept in passenger service," the report says.

The recommendations stem from NTSB's investigations into five fires involving Silverliner IV railcars that all happened this year:

SEPTA train fire in Ridley Park, Penns

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